학술논문
THE PDS 66 CIRCUMSTELLAR DISK AS SEEN in POLARIZED LIGHT with the GEMINI PLANET IMAGER
Document Type
article
Author
Wolff, SG; Perrin, M; Millar-Blanchaer, MA; Nielsen, EL; Wang, J; Cardwell, A; Chilcote, J; Dong, R; Draper, ZH; Duchěne, G; Fitzgerald, MP; Goodsell, SJ; Grady, CA; Graham, JR; Greenbaum, AZ; Hartung, M; Hibon, P; Hines, DC; Hung, LW; Kalas, P; Macintosh, B; Marchis, F; Marois, C; Pueyo, L; Rantakyrö, FT; Schneider, G; Sivaramakrishnan, A; Wiktorowicz, SJ
Source
Astrophysical Journal Letters. 818(1)
Subject
Language
Abstract
We present H- and K-band imaging polarimetry for the PDS 66 circumstellar disk obtained during the commissioning of the Gemini Planet Imager (GPI). Polarization images reveal a clear detection of the disk in to the 0.″12 inner working angle (IWA) in the H band, almost three times closer to the star than the previous Hubble Space Telescope (HST) observations with NICMOS and STIS (0.″35 effective IWA). The centro-symmetric polarization vectors confirm that the bright inner disk detection is due to circumstellar scattered light. A more diffuse disk extends to a bright outer ring centered at 80 AU. We discuss several physical mechanisms capable of producing the observed ring + gap structure. GPI data confirm enhanced scattering on the east side of the disk that is inferred to be nearer to us. We also detect a lateral asymmetry in the south possibly due to shadowing from material within the IWA. This likely corresponds to a temporally variable azimuthal asymmetry observed in HST/STIS coronagraphic imaging.